已知xˆ2-yˆ2=24,x+y=4,求x-y

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已知xˆ2-yˆ2=24,x+y=4,求x-y已知xˆ2-yˆ2=24,x+y=4,求x-y已知xˆ2-yˆ2=24,x+y=4,求x-yx

已知xˆ2-yˆ2=24,x+y=4,求x-y
已知xˆ2-yˆ2=24,x+y=4,求x-y

已知xˆ2-yˆ2=24,x+y=4,求x-y
x²-y²=24
(x+y)(x-y)=24
∵x+y=4
∴4(x-y)=24
x-y=6

xˆ2-yˆ2=24，x+y=4解得x=5,y=-1

x-y=5+1=6